2. Different raw materials. Obsidian (English name: Obsidian) is a common black gem and volcanic crystal, also known as "Dragon Crystal" and "Ten Victory Stone", which is a naturally occurring silica. Opal, also known as oriental cat's eye, is a rare and precious variety in jewelry. Only emeralds with cat's eye effect can really be called cat's eyes. This kind of gem has parallel "tubular" inclusions in the crystal, so after being processed into an arc-shaped gem, it can reflect light intensively and appear a cat's eye-like light band. Under the illumination of the spotlight flashlight, the rotating cat's eye jewel will open and close, just like the cat's eye, hence the name "cat's eye".
3. Different places of origin. Most obsidian jewelry is produced in Central America and North America, and the national stone of Mexico is obsidian. China also produces obsidian, such as some places in Tibet. Cat's eye is mainly produced in Sri Lanka, Brazil and other places. Cat's eye in Sri Lanka has always been famous in the world.